FYI, my latest Trailhead Live broadcast is now available on-demand.

Prepare for the B2C Developer Certification: What You Need To Know About Merchandising (Part 1)

https://trailhead.salesforce.com/live/videos/a2r3k000001n2l4/prepare-for-the-b2c-developer-certification-what-you-need-to-know-about-merchandising